`null` value in `GraphConfigField` causes graph load failure

[myxie]

Hi team,

I was trying to load the cdeconvolver graph that Alex put together, and I just had a 'hanging' loading animation (no warnings).

Looking at the console, I caught a warning Uncaught TypeError: can't access property "toString", data.value is null for GraphConfig.ts.

It looks like there is an erroneous null value stored in one of the cdeconcolver.graph GraphConfigurations (line 171). This seems to be read as null by JavaScript, rather than a string, so toString fails. I was able to successfully load the graph by changing the value to the empty string ("").

Version: v6.7.0
Commit Hash: 9974878